I got home and noticed that my cellular data was turned on.
I didn't do it.
What are the apps or ways cellular data can be turned on without me personally flipping the switch?
I pay a lot for my cellular data.

Who is Participating?

I have an iPhone SE (6s) with IOS 9.3.3. In the setting noted above, you need to turn MUCH off to not use Cellular. I have about 2 dozen items. If you turn most things OFF, you can leave Cellular Data ON for those times when you need it.

Personally, I share a data plan with my wife and mother in law. Data was being chewed up each month. I found out Instagram and Facebook were the culprit so I turned off cellular data for those two apps on their phones, and viola the data is in control.

Network apps like email can turn on cellular data (because it overrides Wi-Fi). A basic phone has cellular.

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brothertruffle880Author Commented: 2016-08-12

SOLUTION FOUND!
Dear All: I'll assign points to the useful suggestions I received however, in my particular case, here's the actual reason I randomly found my cellular data turned on for NO REASON!
===> I reset my network settings!!!!!!! <====
Turns out that when you perform a network reset "Cellular" gets turned on!!!! Even though Cellular was formerly off.
Here's how to reset your network settings just in case you don't have the documentation to hand.
SETTINGS ==> GENERAL ==> RESET ==> RESET NETWORK SETTINGS